Using the black Sharkhon Big Head Mount for Underwater Camera System, you can attach Sharkhon's optional T-Mount, Orb, Duo, and Grip mounts to their Casa-10/20/30 trays. These mounts allow you to attach underwater photography equipment, such as camera housings and lighting arms. The Big Head is part of Sharkhon's modular Anto Series of underwater camera system components. It's equipped with a standard 1/4"-20 threaded mounting stud. Built for durability, it's constructed from CNC machined aluminum, which has been anodized to resist corrosion.